...Jared B. Shaftoe; Jennifer Geddes-McAlister; Todd E. Gillis ABSTRACT A decrease in environmental temperature represents a challenge to the cardiovascular system of ectotherms. To gain insight into the cellular changes that occur during cold exposure and cold acclimation we characterized the cardiac...

... exposure, identifying an understudied form of hypertrophy. Pathological hypertrophy Seasonality Mus musculus Microtus pennsylvanicus Peromyscus leucopus Rodent Cold acclimation Winter Volume overload References Abel , E. D. and Doenst , T. ( 2011 ). Mitochondrial...

... organs, state 4 respiration (S4R) and cytochrome c oxidase (CCO) activity in the pectoral muscle and organs, metabolites in the pectoral muscle, energy intake, histological dynamics and the activity of duodenal digestive enzymes. Warm acclimation decreased BMR to a greater extent than cold acclimation...

... (27°C) temperatures, we expected to observe an upregulation of pectoralis muscle and liver respiratory capacity that would be visible in mitochondrial adjustments in cold-acclimated birds. We also predicted that these adjustments would correlate with thermogenic capacity ( M sum ) and basal metabolic...

... conducted cold acclimation experiments where we measured the adjustment of specific steps in OXPHOS at two assay temperatures (10 and 20°C) following 4 weeks of acclimation under normal (22°C) or low (5°C) temperature conditions. At the low temperature, the contribution of the NADH pathway to the maximal...

... muscle during cold acclimation and possible involvement of the l -arginine/nitric oxide-producing pathway. Rats exposed to cold (4±1°C) for periods of 1, 3, 7, 12, 21 and 45 days were divided into three groups: untreated, l -arginine treated and N ω -nitro- l -arginine methyl ester ( l -NAME) treated...

...Dorthe Waagner; Martin Holmstrup; Mark Bayley; Jesper G. Sørensen SUMMARY During cold periods ectotherms may improve low temperature tolerance via rapid cold hardening (RCH) over a period of hours and/or long-term cold acclimation (LTCA) during days, weeks or months. However, the effect of duration...

... for correspondence ( [email protected] ) 5 1 2012 23 4 2012 © 2012. 2012 chill coma recovery cold tolerance cryoprotectant cold acclimation reproductive diapause seasonality Adaptation of ectothermic organisms to seasonally fluctuating environments typically leads...

... of egg production interacted with the costs of other essential processes (such as cold acclimation and active heat production), we measured the MR of non-breeding and egg-producing zebra finches ( Taeniopygia guttata ) while (a) warm-acclimated (to 19–21°C) and measured within their thermoneutral zone...

... and cold acclimation in the laboratory. By contrast, the GPL changes related to desiccation and diapause progression were relatively small, differed qualitatively from the cold-acclimation response, and were accompanied with no increase of chill tolerance. Other features of autumnal acclimatization, i.e...

... contents were measured in the aquatic subterranean crustacean Niphargus rhenorhodanensis and in the morphologically close surface-dwelling aquatic crustacean Gammarus fossarum , both acclimated at 12°C, 3°C and -2°C. Cold acclimation induced an increase in the T c values in both species but no survival...

... investigated cold acclimation in a migrant shorebird known for extreme physiological flexibility, the red knot ( Calidris canutus , the northerly wintering subspecies islandica ). We measured BMR and M sum over two months in birds caught in the wild and transferred to experimentally controlled conditions...

... populations of the North Sea and the Barents Sea,respectively. In white muscle, cold acclimation caused a parallel increase in citrate synthase (CS) and in cytochrome c oxidase (COX) activities,but with a much larger effect in the cold eurythermal Arctic population. In liver, cold acclimation was accompanied...

... remained unaltered, cold acclimation (8°C)increased HIF-1α protein amounts in the liver, gills and heart and HIF-1 DNA binding activity in the heart, gills and kidney of crucian carp by two- to threefold compared to warm acclimated fish (26°C). In the heart and kidney HIF-1 activity was already...

...Daniela Storch; Gisela Lannig; Hans O. Pörtner SUMMARY For an evaluation of effects of seasonal cold acclimation and evolutionary cold adaptation on protein synthesis capacity, the protein synthesis apparatus was isolated from the gills and white muscle of Antarctic eelpout Pachycara...

... and significantly as swimming velocity approached the critical swimming speed( U crit ). Unsteady swimming behaviours during the graded exercise, however, caused abrupt and generally short-lived decreases in P v O 2 . For the cold-acclimated (6-10°C)fish, P v O 2 reached a minimum plateau value of 15.3±3.7 torr (1...

...S. Brooks; G. T. Clark; S. M. Wright; R. J. Trueman; A. D. Postle; A. R. Cossins; N. M. Maclean SUMMARY Cold acclimation of carp from 30°C to 10°C causes a restructuring of liver microsomal phospholipids characterised by increased proportions of monounsaturated fatty acid in phosphatidylcholine (PC...

...R. J. Trueman; P. E. Tiku; M. X. Caddick; A. R. Cossins ABSTRACT Cold acclimation induces a transient enzymatic activation of the acyl CoA-Δ 9 -desaturase in carp liver. We have determined thresholds for two underlying mechanisms; namely, the activation of latent enzyme and the induced synthesis...